Conveners
Parallel Session 4: F - Collider experiment and pheno
- V. Daniel Elvira (Fermilab)
Parallel Session 4: A - Tevatron anomalies pheno
- Bogdan Dobrescu ()
Parallel Session 4: B - SUSY pheno
- Nausheen Shah (FNAL)
Parallel Session 4: G - SUSY and collider pheno
- Gerben Stavenga (Fermilab)
Parallel Session 4: C - Dark matter
- Matthew Buckley (Fermilab)
Parallel Session 4: D - Higgs and SUSY fits
- John Conway ()
Mr
Daniel Wiesler
(DESY)
29/08/2011, 14:30
Supersymmetric (SUSY) Grand Unified Theories based on exceptional gauge
groups like E6 have recently triggered a lot of interest. Aside from
top-down motivations, they contain phenomenologically interesting states with leptoquark quantum numbers. Their SUSY partners, leptoquarkinos, will appear like all R-odd particles in decay cascades, but mass edges in kinematic distributions --...
Dr
Brooks Thomas
(University of Arizona)
29/08/2011, 14:30
In this talk, I will present an alternative framework for dark matter physics in which the dark matter of the universe comprises a vast ensemble of interacting fields with a variety of different masses, mixings, and abundances. The constituents of this ensemble are not required to be stable individually; rather, the decay widths of these fields are balanced against their abundances in such a...
Mr
Martin Jankowiak
(Stanford University/SLAC)
29/08/2011, 14:30
Higgs: phenomenology
A new jet observable, dipolarity, is introduced that can distinguish whether a pair of subjets arises from a color singlet source. This observable is incorporated into the HEPTopTagger and is shown to improve discrimination between top jets and QCD jets for moderate to high pT.
Prof.
Shufang Su
(University of Arizona)
29/08/2011, 14:30
Given the current results on the Supersymmetry searches at the LHC,
we explore scenarios in which the only accessible SUSY states are the electroweak
sector: neutralinos, charginos and sleptons. We study the process where those electroweak interacting particles are directly produced and analyze the possible reaches at the LHC.
Dr
Sven Heinemeyer
(IFCA (CSIC, Santander))
29/08/2011, 14:30
We present the latest results of the MasterCode collaboration on global SUSY fits.
Currently available experimental data are used to determine the preferred SUSY and Higgs boson mass scales. The data comprise a combination of high-energy SUSY searches, low-energy precision measurements and astrophysical data. We include all relevant LHC searches for SUSY, electroweak precision observables...
Philip Tanedo
(Cornell University)
29/08/2011, 14:50
We propose that the fermionic superpartner of a weak-scale Goldstone boson can be a natural WIMP candidate. The p-wave annihilation of this `Goldstone fermion' into pairs of Goldstone bosons automatically generates the correct relic abundance, whereas the XENON100 direct detection bounds are evaded due to suppressed couplings to the Standard Model. Further, it is able to avoid indirect...
Silja Christine Brensing
(DESY)
29/08/2011, 14:50
SUSY: phenomenology
In this talk we will present the most precise theoretical prediction for squark-antisquark production in hadronic collisions. The production of a squark-antisquark pair is among the most important production channels for supersymmetric particle (sparticle) production processes at the LHC since the production of sparticles is dominated by processes involving coloured sparticles in the final...
Dr
Zdenek Hubacek
(CEA Saclay, Irfu/SPP)
29/08/2011, 14:50
Dr
Margarete Muhlleitner
(Karlsruhe Institute of Technology (KIT))
29/08/2011, 15:00
For the correct interpretation of the experimental results of the supersymmetric (SUSY) particle searches an exact knowledge of the SUSY production cross sections and branching ratios is crucial. In SUSY scenarios with a light stop particle stop1 and a small mass difference to the lightest supersymmetric particle (LSP)assumed to be the lightest neutralino, the flavour changing neutral current...
Dr
Ian-Woo Kim
(University of Michigan)
29/08/2011, 15:00
We carry out a comprehensive analysis of models for top A_FB at the Tevatron in light of new top data arriving from the LHC. We begin with a careful Tevatron analysis, considering in general which sets of effective vertices give rise to a large forward-backward asymmetry while suppressing the contribution to the total ttbar cross-section. We show on general grounds that scalar models struggle...
Wei-Chih Huang
(Northwestern University)
29/08/2011, 15:10
We consider a new scenario for supersymmetric decaying dark matter without $R$-parity violation in theories with goldstini, which arise if supersymmetry is broken independently by multiple sequestered sectors. The uneaten goldstino naturally has a long lifetime and decays into three-body final states including the gravitino, which escapes detection, and two visible particles. The goldstini...
Dr
Jae Yong Lee
(Korea University)
29/08/2011, 15:10
SUSY: phenomenology
Pole mass of the gluino in the minimal gauge mediation is computed to the two-loop order in the framework of the regularization by dimension reduction. We compare the next-to-leading order contributions to the pole mass of the gluino with the leading order contribution.
Dr
Shou-hua Zhu
(ITP, Peking University)
29/08/2011, 15:25
I will cover our recent studies on asymmetries at hadron colliders and related physics beyond standard model. The topics include: (1) One-side forward-backward asymmetry and edge charge asymmetry in top pair production at LHC; (2) New light color octet vector boson and di-jet and top forward-backward asymmetry anormalies observed by Tevatron.
Mr
Jasper Hasenkamp
(Hamburg U.)
29/08/2011, 15:30
SUSY: phenomenology
Current CMB observations could confirm an increase of the effective
neutrino degrees of freedom after primordial nucleosynthesis but before
photon decoupling. We show that, if the gravitino problem is solved
by a light axino, dark (decoupled) radiation emerges naturally in this
period leading to a new upper bound on the reheating temperature < 10^10 GeV. In turn, successful thermal...
Mr
Feng Luo
(University of Minnesota)
29/08/2011, 15:30
We consider the effects of uncertainties in nuclear reaction rates on the cosmological constraints on the decays of unstable particles during or after Big-Bang nucleosynthesis (BBN). We identify the nuclear reactions due to non-thermal hadrons that are the most important in perturbing standard BBN, then quantify the uncertainties in these reactions and in the resulting light-element...
Dr
David Lopez-Val
(Institut fur Theoretische Physik, Heidelberg University)
29/08/2011, 15:30
SUSY: phenomenology
The associated production of squarks and neutralinos/charginos is a trademark supersymmetry signature. In this talk we present a complete NLO analysis of squark/neutralino and squark/chargino production
at the LHC, carried out in the fully automated MadGolem setup.
MadGolem is a new computational tool that automatizes NLO calculations of generic 2->2 New Physics processes as part of...
Guo Chen
(University of Kansas)
29/08/2011, 15:30
Sunghoon Jung
(University of Michigan)
29/08/2011, 15:50
Both CDF and D0 have observed unexpectedly large forward-backward asymmetry of top quarks. To convincingly identify the origin of the measured deviation, the LHC measurement of corresponding observable would be important. Among various potential causes, one possible explanation is from additional new t-channel production mode of top pairs. Interestingly, most t-channel new physics models are...
Dr
Tong Li
(University of Delaware)
29/08/2011, 15:50
SUSY: phenomenology
We investigate the collider phenomenology of gluino-bino co-annihilation scenario at the 7 TeV LHC. This scenario can be realized in a class of realistic supersymmetric models with non-universal gaugino masses and t-b-\tau Yukawa unification. The NLSP gluino and LSP bino should be nearly degenerate in mass, so that the typical gluino search channels involving leptons or hard jets are not...
Roberto Vega Morales
(Northwestern University)
29/08/2011, 15:50
We perform a study of the expected significance of a Standard Model Higgs Boson signal at a 7 TeV LHC. Specifically we examine the H -> ZZ -> l+l-l+l- "Golden Channel" for a Higgs mass range of 175-350 GeV at various luminosities. We also examine exclusion limits should a signal not be seen.
Dr
Matthew Szydagis
(UC Davis)
29/08/2011, 15:50
The LUX (Large Underground Xenon) experiment will attempt to
directly detect the WIMP (Weakly Interacting Massive Particle), or, in the case of no signal, produce improved, world-class limits on the WIMP-nucleon interaction cross-section. The detector is two-phase, utilizing an electric field to drift charge liberated by a recoil event in the liquid, producing additional scintillation in the...
Mr
Gardner Marshall
(The College of William and Mary)
29/08/2011, 15:50
Higgs: phenomenology
In the leptophilic model, one Higgs doublet couples to quarks and another couples to leptons. We study the supersymmetric version of this model, concentrating on the tightly constrained Higgs sector, which has four doublets. Constraints from perturbativity, unitarity, and LEP bounds are considered. It is found that the lightest Higgs, h, can have a mass well below 114 GeV, and for masses below...